i corrected the category for the mbp
i think that it might not be that expensive
here are the ifixit prices...
aiport card 79,95
battery 109,95
keyboard 99,95
superdrive 149,95
but i'm pretty sure that you have many other options for those parts
ebay.com
airport card around 11
battery 26 (but this might be a pretty crappy battery)
keyboard 30
suerdrive 40
those are all "buy it now" prices - auction prices can be lower.....